how to know the domain and range of a function?

The function f, defined by f(x) = x², whose domain { x | x∈R} and range { f(x) | f(x)≥0} I would like to know how Matlab can return the domain and range of a function, i.e. I type:

y = x^2;

and after that I want to know the domain and range of that function, How could I do it?, thank you so much.

[José Sanches]

hi

looking for the same thing

[Bjorn Gustavsson]

That seems like a very difficult task to solve. Your hypothetical range_domain_finder function would be able to detect even the most narrow peaks and valleys in a potentially infinitely large domain, and how would it be able to determine the domain of for example the function ?, is it {x | x>0} or {}, and why one and not the other?